Heat strengthening and improvement of wear resistance of surface layers of parts produced by casting using consumable 35GL steel patterns

The chemical composition of a hard alloy and a steel, as well as the microstructure, phase composition, hardness, microhardness, and depth of a hard-alloy coating on specimens produced by casting using a foamed polystyrene consumable pattern with the working surface covered with a powdered hard alloy, are studied. Results of the abrasive wear of the cast specimens with the hard-alloy coating before and after heat treatment with double phase recrystallization are presented. It has been found that the heat treatment with double phase recrystallization of these parts increases their abrasive wear resistance by 3–4 times.     

Effect of Heat Treatment on the Wear Resistance of Parts with Hard-Alloy Coatings

The phase composition, structure, and abrasive resistance of hard-alloy coatings on parts obtained by cavityless casting and coated on the surface with sormite PG-S27 powder luting with an additive of 2 – 6% B₄C are investigated. The results of the evaluation of the structure and wear resistance of the hard-alloy coating are analyzed in the initial condition and after standard and double heat treatment. An optimum mode of double heat treatment providing a highly wear-resistant structure is suggested.